EP0823555B1 - Centrifugal ventilation device of enhanced performance having at least two suction inlets and related ventilation method - Google Patents

Centrifugal ventilation device of enhanced performance having at least two suction inlets and related ventilation method Download PDF

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Publication number
EP0823555B1
EP0823555B1 EP97420141A EP97420141A EP0823555B1 EP 0823555 B1 EP0823555 B1 EP 0823555B1 EP 97420141 A EP97420141 A EP 97420141A EP 97420141 A EP97420141 A EP 97420141A EP 0823555 B1 EP0823555 B1 EP 0823555B1
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EP
European Patent Office
Prior art keywords
regulation
fineness
inlet
ventilation
partial
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EP97420141A
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German (de)
French (fr)
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EP0823555A1 (en
Inventor
Alain Francois Emile Godichon
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Howden Solyvent Ventec SAS
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ABB Solyvent Ventec SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/424—Double entry casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/162—Double suction pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/003—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by throttling

Definitions

  • the present invention relates to the general technical field of centrifugal type ventilation devices and methods comprising at least two suction inlets for the fluid to be ventilated, arranged laterally opposite of the ventilation wheel.
  • the present invention relates to a centrifugal ventilation device, comprising at least one discharge section, and at least two inlet fluid arranged on either side of a ventilation wheel, capable of being driven in rotation by a drive means, each input being associated with a fluid regulation system, capable of creating a flow asymmetric suction between the inputs.
  • the present invention also relates to a ventilation method centrifugal of a fluid, in which, continuously and successively, sucks the fluid to be ventilated by a centrifugal wheel, through at least two inputs, located on either side of the wheel, to create at least one flow suction, the flow rate of the suction flow is regulated asymmetrically between the inputs, using regulation systems associated with each input, and the suction flow is expelled by the centrifugal wheel, through a discharge outlet.
  • type ventilation units centrifugal In these industrial applications, there are classically two main types of ventilation unit, i.e. type ventilation units centrifugal, and axial type ventilation units, it being understood that the present invention relates more particularly to fans of the type centrifugal, in which the fluid to be ventilated is sucked laterally, relative to the ventilation wheel, by at least two inputs, to be then expelled by the centrifugal force created by the vanes of the impeller ventilation.
  • tilters are formed by a series of blades rotatably mounted around an axis and arranged on a circle, for example coaxial with the ventilation wheel, at the level of the suction inlets arranged on either side of the wheel.
  • the registers are also formed by a series of blades mounted in a cover, with possibility of rotation and angular orientation around axes parallel.
  • the deflector elements are functionally connected to at least one means of control of their position and angular orientation, and by conventional means drive, such as a servo motor. It is thus possible to position the deflector elements associated with an inlet to vary the flow suction.
  • This curve shows, according to the angular position of the deflector elements and the operating intensity of the fan, expressed as a percentage, as a function of the maximum flow rate authorized by the installation, the evolution of the yield as a function of the flow over a given installation, the resistance of this system varying proportionally squared this flow.
  • step ventilation units To improve the efficiency of step ventilation units partial, it has already been proposed by DE-A-25 38 066, in the case of centrifugal fans fitted with tilt control systems, asynchronously or asymmetrically control the orientation of the tilts from one entry relative to the other. This asymmetry of functioning in the suction flow allows a significant improvement the performance of the partial operation ventilation unit. However, it appears that the economic optimum operating of these devices is obtained for high partial steps.
  • the object of the present invention therefore aims to improve the ventilation devices and methods mentioned above, and to be proposed a centrifugal ventilation method and device, the efficiency of which is maximum at all stages of partial operation, and the cost of achievement and operation is at its lowest.
  • Another object of the invention is to propose a new device and centrifugal ventilation process, in which the performance improvements are obtained using particularly simple technical means in action.
  • a complementary object of the invention aims to propose a new centrifugal ventilation device and method, particularly simple to adapt from the structure of most existing centrifugal fans, without change the general operating constraints.
  • Another object of the invention is to propose a new device and centrifugal ventilation process, in which the pressure drops are limited.
  • the objects assigned to the invention are achieved using a device for partial operation centrifugal ventilation with at least one outlet delivery and at least two fluid inlets arranged on either side a ventilation wheel capable of being rotated by a means each input being associated with a system for regulating the fluid suction flow capable of creating an asymmetrical suction flow between the inputs for ensuring partial operation of said device, characterized in that that the inputs are equipped with non-identical control systems which differ from each other by their mechanical structures and characteristics relative finesse of regulation so as to master and model the shape of the regulation curve at all operating gaits partial.
  • FIGS 2, 3 and 5 show a general view of a ventilation unit centrifugal 1 at partial operation, comprising at least two fluid inlets 2,3 arranged on either side of a ventilation wheel 4, mounted and supported in rotation by an axis 5, itself capable of being rotated by through a drive means (not shown in the figures), such than an electric motor, for example.
  • a drive means such than an electric motor, for example.
  • the centrifugal ventilation unit 1 can be unique, or on the contrary integrated in a ventilation device comprising several units of centrifugal ventilation.
  • fluid any gas or any gaseous mixture charged or not with particles of all kinds, solid or liquid for example, it being understood that, in the most common case, the fluid to be ventilated will have a composition little different from that of air.
  • the inputs 2, 3 are arranged laterally and symmetrically with respect to the main axis of symmetry x-x 'of the fan centrifugal 1, materialized by a central disc 10, of which the two lateral faces are provided with a series of blades 11, covered by flanges 12 of profiles variable, suitable for the type of centrifugal fan, the characteristics of the fluid to ventilate and its main use.
  • the flanges 12 can be conical or flat.
  • the assembly constituted by the central disc 10, the vanes 11 and the flanges 12, forms the ventilation wheel 4, integrated in a main frame 13, forming the general structure of the centrifugal fan 1.
  • Each series of blades 11 is associated with an input 2,3 and ensures, for each input, the individual fluid supply function to the downstream parts of the fan.
  • Associated supporting documents to the main frame are of classical design and well known to the man of art, and will therefore not be described in more detail.
  • the inputs 2, 3 are two in number, separate, and include an internal channel 14, forming the suction section of each inlet, said channel being delimited externally by a suction hood 17, covering each inlet 2, 3.
  • the main axis y-y 'of the cover suction 17 can be tilted upward relative to the horizontal.
  • the section and the dimensions of each entry 2, 3, and the 17 associated suction hoods are identical.
  • the centrifugal fan 1 also has at least one outlet for delivery 20, arranged downstream of the centrifugal wheel 4, considering the direction of fluid flow through the fan.
  • the discharge outlet 20 is central and arranged in the general axis of symmetry x-x 'of the centrifugal fan 1. In centrifugal fans, mixing the flows from each inlet 2,3 takes place in the envelope delimiting said outlet 20 just before expulsion of the resulting single flow.
  • the centrifugal fan 1, according to the invention, is also provided regulation systems 30 for the fluid suction flow through each input 2, 3.
  • the regulation systems 30 are formed by means conventional and known in the prior art, such as deflector elements of the direction and flow of the fluid through the inlets.
  • FIG. 2 shows a deflector element constituted by a series of blades 31, constituting a regulation system 30 with incliners.
  • Other regulation systems 30 are obviously conceivable, such than register or shutter systems, as will be shown more in detail in the description which follows.
  • the regulation 30 associated with each input 2, 3 are connected to a system of 20 'control of the partial operation of the fan shown in Figure 2.
  • Said system 20 comprises a drive member 21, such as a servomotor or a hydraulic cylinder, and an actuating means including by example a rod-crank assembly 22, indirectly connected to the blades 31, of so as to maintain or modify their angular position in space.
  • a drive member 21 such as a servomotor or a hydraulic cylinder
  • an actuating means including by example a rod-crank assembly 22, indirectly connected to the blades 31, of so as to maintain or modify their angular position in space.
  • the rod-crank assembly 22 it is possible to use any equivalent technical means, such as gears or cams.
  • the control system 20 ' is common at the two entrances 2, 3 and has an asymmetry in the organs of ordered.
  • the inputs 2, 3 are equipped with regulation 30, which differ from each other by their mechanical structures and by their relative characteristics of finesse of regulation.
  • the mounting of regulation systems 30 which are not identical and which therefore have performances different regulation, creates an asymmetrical suction flow between each entry 2, 3.
  • the finesse of regulation of a device is appreciated compared to another device, by the variation of the absorbed power necessary to operate the device, being it is understood that the comparison is made for the same pace of operation ie for the same flow.
  • the regulation systems 30 differ from each other by a finesse difference of regulation at least equal to 5%, and preferably between 5 and 20%.
  • a centrifugal ventilation device 1 will include therefore, non-identical control systems 30 ensuring comparatively a finer regulation finesse for one of its inputs 2, compared to the other input 3.
  • FIGS 3 and 4 show a first alternative embodiment of the invention, in which the inlet 3 is provided with a movable flap 40 of closing regulation while input 2 is equipped with a regulation register 35.
  • the deflector elements of the regulation register 35 are formed by a series of fins 35a, mounted in a chamber suction 16, located upstream of the suction channel 14 of the inlet 2, and preferably forming the upper inlet portion of the suction hood 17.
  • the fins 35a advantageously of substantially rectangular shape are mounted side by side in the suction chamber 16 along the axis longitudinal of the entry section of said chamber 16.
  • the fins 35a are arranged parallel to each other and extend advantageously over the entire suction section, so that completely block said suction section.
  • the fins 35a can occupy any angular intermediate position between 0 ° and 90 °, the angular position corresponding to 90 °, defining the open position of the register 35.
  • the movable shutter 40 for regulation-closing is presented under the shape of a substantially rectangular plate mounted, by one of its ends, in rotation on an axis 41 integral with the cover 17.
  • the movable flap 40 can occupy, relative to the opening defining entry 2, any position angular intermediary between a closed position and an angular position open, whose geometric position matches are similar to those given previously.
  • the movable flap 40 is more particularly intended to operate discontinuously between a closed and open position, the intermediate positions being practically unused.
  • FIG. 3 illustrates a position of the movable flap 40 in closed position, or substantially closed
  • Figure 5 illustrates a position of the movable flap 40 in the open position.
  • Figure 6 shows more in detail the range of different positioning possibilities of the movable flap 40 mounted in a suction hood 17a, similar to the suction hood 17 of the suction register 35.
  • the regulation system 30 constituted by the regulation register 35 forms the regulation system which has the best regulation finesse, compared to the movable flap 40.
  • the centrifugal ventilation device 1, according to the invention can be fitted of a combination of two other regulation systems 30.
  • This variant differs from the variant described above only by the replacement of ventilation damper 35 with a tilt system regulation 60, the other regulation system 30 being formed by a movable flap 40.
  • the regulating tilting device 60 presents itself, as is well known in trapezoidal, of constant thickness or not, mounted individually movable around an axis of rotation 62.
  • the blades 61 are arranged side by side, of preferably at equal distance from each other, in the suction channel 14, and mounted in a circle concentric with the ventilation wheel 4.
  • the blades 61 occupy an inclined position around their axis of rotation 62, relative to the extension plane of the central disc 10.
  • Each blade 61 being connected to the rod-crank assembly 22 and to the command 21, it is thus possible to modify the positioning and the orientation angular of each blade 61, and this in a synchronous manner, for the whole series of blades 61 associated with the corresponding input 2.
  • the dimensions and shapes of each series of blades 61 are such that in the so-called closed position, corresponding to an angular position defining an angulation equal to 0 °; the peripheral crown which they form between them substantially closes the suction channel 14 completely, the admitted fluid then being almost no.
  • the blades 61 can occupy any discrete angular position included for example between 0 and 105 °, and preferably between 0 ° and 90 °, being understood that from the zero angular position defined above, the direction movement and opening of the blades 61 must ensure a gyration of the flow of fluid in the direction of rotation of the centrifugal wheel 4.
  • a position angular blades 61 defined as being between 90 ° and 105 °, the flow rate of the suction flow will be maximum, since corresponding substantially to the thickness and at the average cross section near the blades 61, at all channel suction section 14.
  • the tilting system of regulation 60 is the regulation system with the best finesse regulation, while the movable flap system 40 constitutes the regulation with the most basic finesse of regulation.
  • the system movable flap 40 nevertheless constitutes a system with low pressure drop, full opening, compared to the tilting regulation system 60.
  • FIG. 7 illustrates a third alternative embodiment, in accordance with the invention, of general design identical to the previous variants, the regulation system 30 associated with an input 2 being formed by an incliner regulation 60, the other regulation system 30 associated with input 3 being a regulation register 35.
  • the regulation system inclinator 60 is the system with the best finesse of regulation, the regulation register system 35 being the system presenting the finesse of most basic regulation.
  • FIG. 7 also illustrates an additional alternative embodiment of the invention, which differs from all the previous variants only in that presence, outside the main frame 13 of the ventilation device centrifugal 1, of a suction sheath 50 disposed upstream of the covers suction 17.
  • the suction sheath 50 comprises an inlet duct 51, dividing into two secondary ducts 52, 53, respectively connected to inputs 2 and 3 via covers according to this variant embodiment, it is possible to have indifferently recourse to any combination of regulation 30 described above.
  • the section of each secondary conduits 52, 53 is equal so as to divide the flow suction at this level in two substantially equal suction flows.
  • the regulation systems 30 equipping each input 2, 3 can be same type, for example two regulating incliners 60 or two registers of regulation 35 as soon as they differ from each other by their structures mechanical.
  • mechanical differences carry advantageously on the geometry of the systems and include variations, cumulative or not, of dimensions, numbers, or shapes of the blades.
  • the method according to the invention consists in regulating the flow rate suction in each inlet 2, 3, using regulation systems 30 associated with each input, ensuring a relative finesse of regulation, which is different between each entry 2, 3.
  • Curve c shows the evolution of the yields obtained with a conventional system and method of the prior art, implementing a fan equipped for each of its inputs with regulation systems identical to tilters, the curve c here representing the device having the better regulation finesse.
  • Curves a and b show the results and yield gains obtained using a device and method in accordance with the invention. Curves a and b are almost identical for gaits operating at partial operation in the range 10-80% of flow total, while for convenience of presentation they appear slightly offset in Figure 1.
  • An indication of the angular setting of the blades 35a, or 61, fins or movable flaps 40 is indicated for each of these curves by a couple of numbers expressed in degrees, the first number (located the most left) being relative to the angular opening of the regulation system called “summary”, the second number (located on the far right) relating to the angular opening of the regulation system 30 having the best fine regulation.
  • the method according to the invention consists, according to a first variant of realization, to be closed progressively during step a), the system of regulation 30 presenting the most basic finesse of regulation, then, at during step b) gradually closing the other regulatory system.
  • This first variant is expressed by the graph of the curve b illustrating the performance evolution, in the case of a device equipped with a ventilation damper 35 and a tilt control system 60.
  • the regulation register 35 is used primarily to ensure partial operation of the fan between 80% and 100% of its total flow, the opening of the blades 35a varying gradually from their full opening to their total closure.
  • the losses of yield observed against curve c are low, and largely compensated by the gains obtained at the lower operating ranges, during which only the blades 61 are used to ensure the flow regulation.
  • the method consists, during the step a), to be closed progressively, for running gaits partial high (from 100% to 80% of the total flow), the regulation system 30 exhibiting the best finesse of regulation, then starting step b) with the simultaneous control of the total opening of the regulation system with the best finesse of regulation, while completely closing and quickly the regulation system previously opened and presenting the most basic finesse of regulation.
  • Step b) continues, ensuring the regulation by the regulation system 30 having the best finesse of regulation.
  • These operations are performed while maintaining the fan flow at a substantially constant level (around 80%), before continuing regulation for partial steps of less than 80%, using the system with the best regulation finesse.
  • Implementation of this second variant embodiment is preferably carried out by the combination of a tilting regulation system 60 with a damper regulation, of the movable flap type 40, capable of taking only a closed or open position.
  • the yields obtained according to the invention are significantly superior to prior art regulatory techniques (curve c) for partial fan steps of less than 80%, the yield gains obtained according to curve a (partial step of 80% at 100% of total flow) at high operating speeds, being substantially identical to curve c of the prior art and greater than curve b.
  • the device and method according to the invention allows to benefit from a maximum output for all gaits of partial fan operation. It is indeed possible by the judicious choice of associated regulation systems on the same installation to master and model the shape of the regulation curve for best meet the requirements of the installation using the ventilation.
  • the device and method according to the invention also makes it possible to improve the overall efficiency at full opening of flow control systems, since it implements at least one regulation system, such as a register regulator 35 with blades or a movable flap 40, introducing a loss of load at full opening, significantly lower than the pressure drop capable of being generated by a tilting regulation system 60.
  • the invention also makes it possible to reduce the overall cost of all of the regulatory systems, without reducing its efficiency, but at contrary by increasing it since, even at operating speeds high, the yields obtained are comparable to the best systems currently known.

Abstract

The centrifugal ventilator (1) has an outlet (20) and at least two intakes (2,3) situated on either side of a rotor (4) powered by a drive. Each intake has a regulating system (30) designed to create an asymmetrical intake flow for operating the ventilator in a partial mode. The regulating systems differ in their mechanical structure and their degree of fine or coarse control. One regulating system is in the form of a shutter and the other has one or more louvres.

Description

La présente invention se rapporte au domaine technique général des dispositifs et procédés de ventilation de type centrifuge, comportant au moins deux entrées d'aspiration du fluide à ventiler, disposées latéralement en regard de la roue de ventilation.The present invention relates to the general technical field of centrifugal type ventilation devices and methods comprising at least two suction inlets for the fluid to be ventilated, arranged laterally opposite of the ventilation wheel.

La présente invention concerne un dispositif de ventilation centrifuge, comportant au moins une section de refoulement, et au moins deux entrées de fluide disposées de part et d'autre d'une roue de ventilation, susceptible d'être entraínée en rotation par un moyen d'entraínement, chaque entrée étant associée à un système de régulation du fluide, apte à créer un débit d'aspiration dissymétrique entre les entrées.The present invention relates to a centrifugal ventilation device, comprising at least one discharge section, and at least two inlet fluid arranged on either side of a ventilation wheel, capable of being driven in rotation by a drive means, each input being associated with a fluid regulation system, capable of creating a flow asymmetric suction between the inputs.

La présente invention concerne également un procédé de ventilation centrifuge d'un fluide, dans lequel, de manière continue et successive, on aspire le fluide à ventiler par une roue centrifuge, à travers au moins deux entrées, situées de part et d'autre de la roue, pour créer au moins un flux d'aspiration , on régule le débit du flux d'aspiration de manière dissymétrique entre les entrées, à l'aide de systèmes de régulation associés à chaque entrée, et on assure l'expulsion du flux d'aspiration par la roue centrifuge, à travers une sortie de refoulement.The present invention also relates to a ventilation method centrifugal of a fluid, in which, continuously and successively, sucks the fluid to be ventilated by a centrifugal wheel, through at least two inputs, located on either side of the wheel, to create at least one flow suction, the flow rate of the suction flow is regulated asymmetrically between the inputs, using regulation systems associated with each input, and the suction flow is expelled by the centrifugal wheel, through a discharge outlet.

Les ventilateurs à usage industriel et à grande capacité sont déjà largement connus et répandus dans de nombreux secteurs industriels. De tels ventilateurs trouvent en effet leur application dans des secteurs industriels aussi variés que : l'industrie nucléaire, l'industrie chimique, l'industrie sidérurgique, l'industrie de la cimenterie, par exemple, ou encore dans des centrales thermiques. Fans for industrial use and large capacity are already widely known and widespread in many industrial sectors. Such fans find their application in industrial sectors as varied as: nuclear industry, chemical industry, industry steel industry, the cement industry, for example, or even in thermal power stations.

Dans ces applications industrielles, on distingue classiquement deux grands types d'unité de ventilation, à savoir les unités de ventilation de type centrifuge, et les unités de ventilation de type axial, étant entendu que la présente invention concerne plus particulièrement les ventilateurs de type centrifuge, dans lesquels le fluide à ventiler est aspiré latéralement, relativement à la roue de ventilation, par au moins deux entrées, pour être ensuite expulsé par la force centrifuge créée par les aubes de la roue de ventilation.In these industrial applications, there are classically two main types of ventilation unit, i.e. type ventilation units centrifugal, and axial type ventilation units, it being understood that the the present invention relates more particularly to fans of the type centrifugal, in which the fluid to be ventilated is sucked laterally, relative to the ventilation wheel, by at least two inputs, to be then expelled by the centrifugal force created by the vanes of the impeller ventilation.

Compte tenu des fortes capacités de ventilation exigées par les applications industrielles mentionnées ci-dessus, de l'ordre, par exemple, de 500 à 5000 kilowatts, voire, dans des cas extrêmes, de 100 à 10 000 kilowatts, on aboutit à la conception d'unités de ventilation à fort dimensionnement, alors même que ces unités sont constituées de pièces en mouvement, sujettes à des contraintes d'utilisation élevées, tant sur le plan des sollicitations mécaniques, que sur le plan de la durée de fonctionnement et des conditions de milieu dans lesquelles ces pièces sont amenées à fonctionner.Given the high ventilation capacities required by industrial applications mentioned above, in the range, for example, of 500 to 5000 kilowatts, or even, in extreme cases, from 100 to 10 000 kilowatts, this leads to the design of large-scale ventilation units, so even as these units are made up of moving parts, subject to high operating constraints, both in terms of mechanical stress, that in terms of operating time and environmental conditions in which these parts are made to operate.

Il est en conséquence reconnu que des critères tels que l'efficacité opérationnelle, la fiabilité technique, le niveau sonore et le coût de fonctionnement, incluant la notion de rendement du ventilateur, sont de la plus haute importance lors de la conception et de l'utilisation de ces appareils.It is therefore recognized that criteria such as efficiency operational, technical reliability, noise level and cost of operation, including the concept of fan efficiency, are most very important when designing and using these devices.

Il a ainsi déjà été proposé de contrôler et faire varier le débit d'aspiration des ventilateurs centrifuges à double entrée, afin de réduire la puissance absorbée, en vue d'obtenir une régulation aérodynamique du débit de l'appareil, gage d'un meilleur rendement, donc d'une économie certaine.It has thus already been proposed to control and vary the suction flow double inlet centrifugal fans to reduce power absorbed, in order to obtain an aerodynamic regulation of the flow of the device, pledge of a better output, therefore of a certain economy.

Ainsi, il est déjà connu de diminuer le débit des ventilateurs centrifuges à double entrée dans un circuit donné, en les équipant d'éléments déflecteurs d'air, tels que des inclineurs ou des registres d'aspiration. Les inclineurs sont formés par une série de pales montées rotative autour d'un axe et disposées sur un cercle, par exemple coaxial à la roue de ventilation, au niveau des entrées d'aspiration disposées de part et d'autre de la roue. Les registres d'aspiration sont également formés par une série de pales montées dans un capot, avec possibilité de rotation et d'orientation angulaire autour d'axes parallèles.Thus, it is already known to reduce the flow rate of centrifugal fans at double entry into a given circuit, by equipping them with deflector elements air, such as tilters or suction registers. The tilters are formed by a series of blades rotatably mounted around an axis and arranged on a circle, for example coaxial with the ventilation wheel, at the level of the suction inlets arranged on either side of the wheel. The registers are also formed by a series of blades mounted in a cover, with possibility of rotation and angular orientation around axes parallel.

Dans les deux réalisations de l'art antérieur décrites précédemment, les éléments déflecteurs sont reliés fonctionnellement à au moins un moyen de commande de leur position et orientation angulaire, et à un moyen classique d'entraínement, tel qu'un servo- moteur. Il est ainsi possible de positionner les éléments déflecteurs associés à une entrée pour faire varier le débit d'aspiration.In the two embodiments of the prior art described above, the deflector elements are functionally connected to at least one means of control of their position and angular orientation, and by conventional means drive, such as a servo motor. It is thus possible to position the deflector elements associated with an inlet to vary the flow suction.

Il est en effet connu qu'en orientant de manière appropriée les éléments déflecteurs, on crée un flux d'air rotatif à l'entrée de la roue de ventilation, ledit flux étant, dans le cas le plus fréquent, dirigé dans le même sens de rotation que celui de la roue de ventilation. Ce flux d'air rotatif a pour conséquence, en comparaison avec d'autres systèmes de régulation de flux sur le circuit, de réduire la puissance absorbée par le ventilateur. Lorsque le déplacement angulaire des éléments déflecteurs associés à chaque entrée est obtenu de manière symétrique, le débit d'aspiration est identique ou sensiblement identique entre chaque entrée, et les résultats obtenus avec de tels dispositifs sont illustrés par la courbe c montrée à la figure 1. Cette courbe montre, selon la position angulaire des éléments déflecteurs et l'intensité de fonctionnement du ventilateur, exprimée en pourcentage, en fonction du débit maximum autorisé par l'installation, l'évolution du rendement en fonction du débit sur une installation donnée , la résistance de ce système variant proportionnellement au carré de ce débit.It is in fact known that by appropriately orienting the elements deflectors, a rotary air flow is created at the inlet of the ventilation wheel, said flow being, in the most frequent case, directed in the same direction of rotation than that of the ventilation wheel. This rotary air flow results in comparison with other flow control systems on the circuit, reduce the power absorbed by the fan. When the displacement angular deflector elements associated with each entry is obtained from symmetrically, the suction flow is identical or substantially identical between each entry, and the results obtained with such devices are illustrated by curve c shown in Figure 1. This curve shows, according to the angular position of the deflector elements and the operating intensity of the fan, expressed as a percentage, as a function of the maximum flow rate authorized by the installation, the evolution of the yield as a function of the flow over a given installation, the resistance of this system varying proportionally squared this flow.

Il est généralement considéré que de tels systèmes de régulation de débit donnent globalement satisfaction, puisqu'ils permettent une amélioration relative du rendement de l'appareil. Néanmoins, il s'avère que les rendements obtenus sont insuffisants, notamment dans les plages de fonctionnement normal des unités de ventilation, correspondant par exemple à des marches partielles de l'ordre de 40 à 80%. It is generally considered that such flow control systems give overall satisfaction, since they allow an improvement relative performance of the device. Nevertheless, it turns out that the yields obtained are insufficient, especially in the operating ranges normal ventilation units, corresponding for example to steps partial of the order of 40 to 80%.

Pour améliorer les rendements des unités de ventilation à marche partielle, il a déjà été proposé par le DE-A-25 38 066, dans le cas de ventilateurs centrifuges équipés de systèmes de régulation à inclineurs, de commander de manière asynchrone ou dissymétrique l'orientation des inclineurs d'une entrée relativement à l'autre. Cette dissymétrie de fonctionnement dans le flux d'aspiration permet une amélioration significative du rendement de l'unité de ventilation à marche partielle. Toutefois, il apparaít que l'optimum économique de fonctionnement de ces appareils est obtenu pour des marches partielles élevées.To improve the efficiency of step ventilation units partial, it has already been proposed by DE-A-25 38 066, in the case of centrifugal fans fitted with tilt control systems, asynchronously or asymmetrically control the orientation of the tilts from one entry relative to the other. This asymmetry of functioning in the suction flow allows a significant improvement the performance of the partial operation ventilation unit. However, it appears that the economic optimum operating of these devices is obtained for high partial steps.

Par ailleurs, le coût de tels dispositifs, surtout pour des machines de ventilation de forte puissance, s'avère être un facteur susceptible de limiter leur diffusion.Furthermore, the cost of such devices, especially for machines for high power ventilation, proves to be a factor likely to limit their diffusion.

L'objet de la présente invention vise en conséquence à améliorer les dispositifs et procédés de ventilation mentionnés précédemment, et à proposer un procédé et dispositif de ventilation centrifuge, dont le rendement est maximal à toutes les allures de fonctionnement partiel, et dont le coût de réalisation et de fonctionnement est au plus bas.The object of the present invention therefore aims to improve the ventilation devices and methods mentioned above, and to be proposed a centrifugal ventilation method and device, the efficiency of which is maximum at all stages of partial operation, and the cost of achievement and operation is at its lowest.

Un autre objet de l'invention vise à proposer un nouveau dispositif et procédé de ventilation centrifuge, dans lequel les améliorations de rendement sont obtenues à l'aide de moyens techniques particulièrement simples à mettre en oeuvre.Another object of the invention is to propose a new device and centrifugal ventilation process, in which the performance improvements are obtained using particularly simple technical means in action.

Un objet complémentaire de l'invention vise à proposer un nouveau dispositif et procédé de ventilation centrifuge, particulièrement simple à adapter à partir de la structure de la plupart des ventilateurs centrifuges existants, sans en changer les contraintes générales de fonctionnement.A complementary object of the invention aims to propose a new centrifugal ventilation device and method, particularly simple to adapt from the structure of most existing centrifugal fans, without change the general operating constraints.

Un autre objet de l'invention vise à proposer un nouveau dispositif et procédé de ventilation centrifuge, dans lequel les pertes de charge sont limitées. Another object of the invention is to propose a new device and centrifugal ventilation process, in which the pressure drops are limited.

Les objets assignés à l'invention sont atteints à l'aide d'un dispositif de ventilation centrifuge à marche partielle comportant au moins une sortie de refoulement et au moins deux entrées de fluide disposées de part et d'autre d'une roue de ventilation susceptible d'être entraínée en rotation par un moyen d'entraínement, chaque entrée étant associée à un système de régulation du flux d'aspiration du fluide apte à créer un débit d'aspiration dissymétrique entre les entrées pour assurer une marche partielle dudit dispositif, caractérisé en ce que les entrées sont équipées de systèmes de régulation non identiques qui diffèrent entre eux par leurs structures mécaniques et leurs caractéristiques relatives de finesse de régulation de manière à maítriser et modeler la forme de la courbe de régulation à toutes les allures de fonctionnement à marche partielle.The objects assigned to the invention are achieved using a device for partial operation centrifugal ventilation with at least one outlet delivery and at least two fluid inlets arranged on either side a ventilation wheel capable of being rotated by a means each input being associated with a system for regulating the fluid suction flow capable of creating an asymmetrical suction flow between the inputs for ensuring partial operation of said device, characterized in that that the inputs are equipped with non-identical control systems which differ from each other by their mechanical structures and characteristics relative finesse of regulation so as to master and model the shape of the regulation curve at all operating gaits partial.

Les objets assignés à l'invention sont également atteints à l'aide d'un procédé de ventilation centrifuge d'un fluide à l'aide d'une unité de ventilation à marche partielle dans lequel de manière continue et successive :

  • on aspire le fluide à ventiler par une roue centrifuge à travers au moins deux entrées situées de part et d'autre de la roue pour créer au moins un flux d'aspiration ;
  • on règle le débit du flux d'aspiration de manière dissymétrique entre les entrées à l'aide de systèmes de régulation associés à chaque entrée pour assurer une marche partielle de l'unité de ventilation;
  • on assure l'expulsion du flux d'aspiration par la roue centrifuge, à travers une sortie de refoulement, caractérisé en ce qu'il consiste à réguler le débit du flux d'aspiration à l'aide de systèmes de régulation assurant une finesse de régulation relative différente entre chaque entrée de manière à maítriser et modeler la forme de la courbe de régulation à toutes les allures de fonctionnement à marche partielle.
The objects assigned to the invention are also achieved using a centrifugal ventilation process for a fluid using a partial operation ventilation unit in which continuously and successively:
  • the fluid to be ventilated is sucked by a centrifugal wheel through at least two inlets located on either side of the wheel to create at least one suction flow;
  • the flow rate of the suction flow is adjusted asymmetrically between the inlets using regulation systems associated with each inlet to ensure partial operation of the ventilation unit;
  • the suction flow is expelled by the centrifugal wheel, through a discharge outlet, characterized in that it consists in regulating the flow rate of the suction flow using regulation systems ensuring a fineness of different relative regulation between each input so as to control and model the shape of the regulation curve at all operating speeds at partial operation.

D'autres détails et avantages de l'invention seront décrits plus en détail à la lumière de la description et des exemples illustratifs qui suivent ci-après, donnés uniquement à titre d'exemples non limitatifs, dans lesquels :

  • la figure 1 montre les courbes comparatives de rendement d'un ventilateur centrifuge de l'art antérieur à double entrée équipé d'inclineurs à orientation symétrique (courbe c) et d'un ventilateur centrifuge à double entrée conforme à l'invention (courbes a et b).
  • la figure 2 représente une vue générale en perspective d'un ventilateur centrifuge à double entrée, conforme à l'invention.
  • la figure 3 représente une vue générale en coupe transversale longitudinale d'une première variante de réalisation d'un ventilateur centrifuge conforme à l'invention.
  • la figure 4 montre, selon une coupe transversale partielle effectuée selon la ligne IV-IV de la figure 3, un détail de réalisation de cette même première variante de réalisation.
  • la figure 5 montre, selon une coupe transversale longitudinale, une seconde variante de réalisation d'un ventilateur centrifuge, conforme à l'invention.
  • la figure 6 représente, selon une coupe latérale effectuée selon la ligne VI-VI de la figure 5, une vue latérale partielle d'un détail de réalisation de cette seconde variante de l'invention.
  • la figure 7 représente, selon une coupe transversale longitudinale, une troisième variante de réalisation conforme à l'invention.
Other details and advantages of the invention will be described in more detail in the light of the description and the illustrative examples which follow below, given solely by way of nonlimiting examples, in which:
  • FIG. 1 shows the comparative efficiency curves of a centrifugal fan of the prior art with double inlet fitted with tilters with symmetrical orientation (curve c) and of a centrifugal fan with double inlet in accordance with the invention (curves a and B).
  • 2 shows a general perspective view of a centrifugal fan with double inlet, according to the invention.
  • 3 shows a general view in longitudinal cross section of a first alternative embodiment of a centrifugal fan according to the invention.
  • Figure 4 shows, in a partial cross section taken along the line IV-IV of Figure 3, a detail of this same first embodiment.
  • Figure 5 shows, in a longitudinal cross section, a second alternative embodiment of a centrifugal fan, according to the invention.
  • 6 shows, in a side section taken along the line VI-VI of Figure 5, a partial side view of a detail of this second embodiment of the invention.
  • Figure 7 shows, in a longitudinal cross section, a third embodiment according to the invention.

Les figures 2, 3 et 5 montrent une vue générale d'une unité de ventilation centrifuge 1à marche partielle, comportant au moins deux entrées 2,3 de fluide disposées de part et d'autre d'une roue de ventilation 4, montée et supportée en rotation par un axe 5, lui-même susceptible d'être entraíné en rotation par l'intermédiaire d'un moyen d'entraínement (non représenté aux figures), tel qu'un moteur électrique, par exemple.Figures 2, 3 and 5 show a general view of a ventilation unit centrifugal 1 at partial operation, comprising at least two fluid inlets 2,3 arranged on either side of a ventilation wheel 4, mounted and supported in rotation by an axis 5, itself capable of being rotated by through a drive means (not shown in the figures), such than an electric motor, for example.

L'unité de ventilation centrifuge 1 peut être unique, ou au contraire intégrée dans un dispositif de ventilation comportant plusieurs unités de ventilation centrifuge.The centrifugal ventilation unit 1 can be unique, or on the contrary integrated in a ventilation device comprising several units of centrifugal ventilation.

Sous le terme "fluide", il convient d'entendre, au sens de l'invention, tout gaz ou tout mélange gazeux chargé ou non en particules de toutes natures, solides ou liquides par exemple, étant entendu que, dans le cas le plus courant, le fluide à ventiler aura une composition peu différente de celle de l'air.Under the term "fluid", it is understood, within the meaning of the invention, any gas or any gaseous mixture charged or not with particles of all kinds, solid or liquid for example, it being understood that, in the most common case, the fluid to be ventilated will have a composition little different from that of air.

Dans le cas le plus simple, les entrées 2, 3 sont disposées latéralement et symétriquement par rapport à l'axe de symétrie principale x-x' du ventilateur centrifuge 1, matérialisé par un disque central 10, dont les deux faces latérales sont pourvues d'une série d'aubes 11, couvertes par des flasques 12 de profils variables, appropriés au type de ventilateur centrifuge, aux caractéristiques du fluide à ventiler et à son utilisation principale. A titre d'exemple, les flasques 12 peuvent être coniques ou plan. L'ensemble constitué par le disque central 10, les aubes 11 et les flasques 12, forme la roue de ventilation 4, intégrée dans un bâti principal 13, formant la structure générale du ventilateur centrifuge 1. Chaque série d'aubes 11 est associée à une entrée 2,3 et assure, pour chacune des entrées, la fonction d'approvisionnement individualisée de fluide vers les parties du ventilateur situées en aval. Les pièces annexes associées au bâti principal sont de conception classique et bien connue de l'homme de l'art, et ne seront en conséquence pas décrites plus en détail.In the simplest case, the inputs 2, 3 are arranged laterally and symmetrically with respect to the main axis of symmetry x-x 'of the fan centrifugal 1, materialized by a central disc 10, of which the two lateral faces are provided with a series of blades 11, covered by flanges 12 of profiles variable, suitable for the type of centrifugal fan, the characteristics of the fluid to ventilate and its main use. For example, the flanges 12 can be conical or flat. The assembly constituted by the central disc 10, the vanes 11 and the flanges 12, forms the ventilation wheel 4, integrated in a main frame 13, forming the general structure of the centrifugal fan 1. Each series of blades 11 is associated with an input 2,3 and ensures, for each input, the individual fluid supply function to the downstream parts of the fan. Associated supporting documents to the main frame are of classical design and well known to the man of art, and will therefore not be described in more detail.

Dans les exemples de réalisation montrés aux figures 3 et 5, les entrées 2, 3 sont au nombre de deux, séparées, et comprennent un canal interne 14, formant la section d'aspiration de chaque entrée, ledit canal étant délimité extérieurement par un capot d'aspiration 17, couvrant chaque entrée 2, 3. Comme cela est représenté à la figure 4, l'axe principal y-y' du capot d'aspiration 17 peut être incliné vers le haut, par rapport à l'horizontale. Avantageusement, la section et les dimensions de chaque entrée 2, 3, et les capots d'aspiration 17 associés sont identiques.In the exemplary embodiments shown in Figures 3 and 5, the inputs 2, 3 are two in number, separate, and include an internal channel 14, forming the suction section of each inlet, said channel being delimited externally by a suction hood 17, covering each inlet 2, 3. As shown in Figure 4, the main axis y-y 'of the cover suction 17 can be tilted upward relative to the horizontal. Advantageously, the section and the dimensions of each entry 2, 3, and the 17 associated suction hoods are identical.

Le ventilateur centrifuge 1 comporte également au moins une sortie de refoulement 20, disposée en aval de la roue centrifuge 4, en considérant le sens de passage du fluide à travers le ventilateur. Dans l'exemple de réalisation montré aux figures 2 à 6, la sortie de refoulement 20 est centrale et disposée dans l'axe de symétrie général x-x' du ventilateur centrifuge 1. Dans les ventilateurs centrifuges, le mélange des flux provenant de chaque entrée 2,3 s'effectue dans l'enveloppe délimitant ladite sortie 20 juste avant l'expulsion du flux unique résultant.The centrifugal fan 1 also has at least one outlet for delivery 20, arranged downstream of the centrifugal wheel 4, considering the direction of fluid flow through the fan. In the example of embodiment shown in Figures 2 to 6, the discharge outlet 20 is central and arranged in the general axis of symmetry x-x 'of the centrifugal fan 1. In centrifugal fans, mixing the flows from each inlet 2,3 takes place in the envelope delimiting said outlet 20 just before expulsion of the resulting single flow.

Le ventilateur centrifuge 1, conforme à l'invention, est également pourvu de systèmes de régulation 30 du flux d'aspiration du fluide à travers chaque entrée 2, 3. Les systèmes de régulation 30 sont formés par des moyens classiques et connus dans l'art antérieur, tels que des éléments déflecteurs de la direction et du cheminement du fluide à travers les entrées. A titre d'exemple illustratif non limitatif, la figure 2 montre un élément déflecteur constitué par une série de pales 31, constituant un système de régulation 30 à inclineurs. D'autres systèmes de régulation 30 sont bien évidemment envisageables, tels que des systèmes à registres ou à volets, tel que cela sera montré plus en détail dans la description qui suit. De manière connue en soi, les systèmes de régulation 30 associés à chaque entrée 2, 3 sont reliés à un système de commande 20' de la marche partielle du ventilateur représenté à la Figure 2. Ledit système 20' comprend un organe d'entraínement 21, tel qu'un servomoteur ou un vérin hydraulique, et un moyen d'actionnement incluant par exemple un ensemble bielle-manivelle 22, relié indirectement aux pales 31, de manière à maintenir ou modifier leur position angulaire dans l'espace. A la place de l'ensemble bielle-manivelle 22, il est envisageable d'avoir recours à tout moyen technique équivalent, tel que des engrenages ou des cames. Tel que cela est montré à la figure 2, le système de commande 20' est commun aux deux entrées 2, 3 et comporte une dissymétrie dans les organes de commande. A titre de variante, il est bien évidemment envisageable de commander les éléments déflecteurs de chaque entrée 2,3 à l'aide d'un ensemble bielle-manivelle séparé, chaque ensemble étant associé à un organe d'entraínement 21.The centrifugal fan 1, according to the invention, is also provided regulation systems 30 for the fluid suction flow through each input 2, 3. The regulation systems 30 are formed by means conventional and known in the prior art, such as deflector elements of the direction and flow of the fluid through the inlets. For exemple nonlimiting illustration, FIG. 2 shows a deflector element constituted by a series of blades 31, constituting a regulation system 30 with incliners. Other regulation systems 30 are obviously conceivable, such than register or shutter systems, as will be shown more in detail in the description which follows. In a manner known per se, the regulation 30 associated with each input 2, 3 are connected to a system of 20 'control of the partial operation of the fan shown in Figure 2. Said system 20 'comprises a drive member 21, such as a servomotor or a hydraulic cylinder, and an actuating means including by example a rod-crank assembly 22, indirectly connected to the blades 31, of so as to maintain or modify their angular position in space. To the instead of the rod-crank assembly 22, it is possible to use any equivalent technical means, such as gears or cams. Phone as shown in figure 2, the control system 20 'is common at the two entrances 2, 3 and has an asymmetry in the organs of ordered. As a variant, it is obviously possible to envisage control the deflector elements of each input 2,3 using a separate rod-crank assembly, each assembly being associated with a member 21.

Selon l'invention, les entrées 2, 3 sont équipées de systèmes de régulation 30, qui diffèrent entre eux par leurs structures mécaniques et par leurs caractéristiques relatives de finesse de régulation. Le montage de systèmes de régulation 30 non identiques et possédant alors des performances de régulation différentes, permet de créer un débit d'aspiration dissymétrique entre chaque entrée 2, 3. Au sens de l'invention, et comme cela est bien accepté dans le domaine technique considéré, la finesse de régulation d'un dispositif s'apprécie comparativement à un autre dispositif, par la variation de la puissance absorbée nécessaire pour faire fonctionner le dispositif, étant entendu que la comparaison s'effectue pour une même allure de fonctionnement c'est à dire pour un même débit. Dans le cadre de l'invention, les systèmes de régulation 30 diffèrent entre eux par un écart de finesse de régulation au moins égal à 5%, et de préférence compris entre 5 et 20%.According to the invention, the inputs 2, 3 are equipped with regulation 30, which differ from each other by their mechanical structures and by their relative characteristics of finesse of regulation. The mounting of regulation systems 30 which are not identical and which therefore have performances different regulation, creates an asymmetrical suction flow between each entry 2, 3. Within the meaning of the invention, and as is well accepted in the technical field considered, the finesse of regulation of a device is appreciated compared to another device, by the variation of the absorbed power necessary to operate the device, being it is understood that the comparison is made for the same pace of operation ie for the same flow. In the context of the invention, the regulation systems 30 differ from each other by a finesse difference of regulation at least equal to 5%, and preferably between 5 and 20%.

Un dispositif de ventilation centrifuge 1 conforme à l'invention comprendra en conséquence, des systèmes de régulation 30 non identiques assurant comparativement une finesse de régulation supérieure pour l'une de ses entrées 2, comparativement à l'autre entrée 3.A centrifugal ventilation device 1 according to the invention will include therefore, non-identical control systems 30 ensuring comparatively a finer regulation finesse for one of its inputs 2, compared to the other input 3.

Les figures 3 et 4 montrent une première variante de réalisation de l'invention, dans laquelle l'entrée 3 est pourvue d'un volet mobile 40 de régulation fermeture alors que l'entrée 2 est équipée d'un registre de régulation 35. De manière classique, les éléments déflecteurs du registre de régulation 35 sont formés par une série d'ailettes 35a, montées dans une chambre d'aspiration 16, située en amont du canal d'aspiration 14 de l'entrée 2, et formant préférentiellement la partie supérieure d'entrée du capot d'aspiration 17. Les ailettes 35a, avantageusement de forme sensiblement rectangulaires sont montés côte à côte dans la chambre d'aspiration 16 selon l'axe longitudinal de la section d'entrée de ladite chambre 16. Dans leur position dite fermée, correspondant à une position angulaire de référence égale à 0°, les ailettes 35a sont disposées parallèlement entre elles et s'étendent avantageusement sur toute la section d'aspiration, de manière à pouvoir obturer complètement ladite section d'aspiration. Les ailettes 35a peuvent occuper toute position intermédiaire angulaire comprise entre 0° et 90°, la position angulaire correspondant à 90°, définissant la position ouverte du registre 35. Le volet mobile 40 de régulation-fermeture se présente sous la forme d'une plaque sensiblement rectangulaire montée, par l'une de ses extrémités, en rotation sur un axe 41 solidaire du capot 17. Le volet mobile 40 peut occuper, relativement à l'ouverture définissant l'entrée 2, toute position intermédiaire angulaire entre une position fermée et une position angulaire ouverte, dont les correspondances de position géométrique sont similaires à celles données précédemment. De manière avantageuse, le volet mobile 40 est plus particulièrement destiné à fonctionner de manière discontinue entre une position de fermeture et d'ouverture, les positions intermédiaires étant pratiquement inutilisées. La figure 3 illustre une position du volet mobile 40 en position fermée, ou sensiblement fermée, alors que la figure 5 illustre une position du volet mobile 40 en position ouverte. La figure 6 montre plus en détail l'éventail des différentes possibilités de positionnement du volet mobile 40 monté dans un capot d'aspiration 17a, semblable au capot d'aspiration 17 du registre d'aspiration 35. Dans cette première variante de réalisation, le système de régulation 30 constitué par le registre de régulation 35 forme le système de régulation qui présente la finesse de régulation la meilleure, comparativement au volet mobile 40.Figures 3 and 4 show a first alternative embodiment of the invention, in which the inlet 3 is provided with a movable flap 40 of closing regulation while input 2 is equipped with a regulation register 35. Conventionally, the deflector elements of the regulation register 35 are formed by a series of fins 35a, mounted in a chamber suction 16, located upstream of the suction channel 14 of the inlet 2, and preferably forming the upper inlet portion of the suction hood 17. The fins 35a, advantageously of substantially rectangular shape are mounted side by side in the suction chamber 16 along the axis longitudinal of the entry section of said chamber 16. In their so-called position closed, corresponding to a reference angular position equal to 0 °, the fins 35a are arranged parallel to each other and extend advantageously over the entire suction section, so that completely block said suction section. The fins 35a can occupy any angular intermediate position between 0 ° and 90 °, the angular position corresponding to 90 °, defining the open position of the register 35. The movable shutter 40 for regulation-closing is presented under the shape of a substantially rectangular plate mounted, by one of its ends, in rotation on an axis 41 integral with the cover 17. The movable flap 40 can occupy, relative to the opening defining entry 2, any position angular intermediary between a closed position and an angular position open, whose geometric position matches are similar to those given previously. Advantageously, the movable flap 40 is more particularly intended to operate discontinuously between a closed and open position, the intermediate positions being practically unused. FIG. 3 illustrates a position of the movable flap 40 in closed position, or substantially closed, while Figure 5 illustrates a position of the movable flap 40 in the open position. Figure 6 shows more in detail the range of different positioning possibilities of the movable flap 40 mounted in a suction hood 17a, similar to the suction hood 17 of the suction register 35. In this first alternative embodiment, the regulation system 30 constituted by the regulation register 35 forms the regulation system which has the best regulation finesse, compared to the movable flap 40.

Selon une deuxième variante de réalisation, illustrée aux figures 5 et 6, le dispositif de ventilation centrifuge 1, conforme à l'invention, peut être équipé d'une combinaison de deux autres systèmes de régulation 30. Cette variante de réalisation ne diffère de la variante décrite précédemment que par le remplacement du registre de ventilation 35 par un système à inclineurs de régulation 60, l'autre système de régulation 30 étant formé par un volet mobile 40. L'inclineur de régulation 60 se présente, comme cela est bien connu dans trapézoïdale, d'épaisseur constante ou non, montées mobiles individuellement autour d'un axe de rotation 62. Les pales 61 sont disposées côte à côte, de préférence à égale distance les unes des autres, dans le canal d'aspiration 14, et montées selon un cercle concentrique à la roue de ventilation 4. Avantageusement, les pales 61 occupent une position inclinée autour de leur axe de rotation 62, relativement au plan d'extension du disque central 10. Chaque pale 61 étant reliée à l'ensemble bielle-manivelle 22 et à l'organe de commande 21, il est ainsi possible de modifier le positionnement et l'orientation angulaire de chaque pale 61, et ce d'une manière synchrone, pour toute la série de pales 61 associées à l'entrée correspondante 2. Les dimensions et formes de chaque série de pales 61 sont telles qu'en position dite fermée, correspondant à une position angulaire définissant une angulation égale à 0° ; la couronne périphérique qu'elles forment entre elles obture sensiblement complètement le canal d'aspiration 14, le fluide admis étant alors quasiment nul.According to a second alternative embodiment, illustrated in FIGS. 5 and 6, the centrifugal ventilation device 1, according to the invention, can be fitted of a combination of two other regulation systems 30. This variant differs from the variant described above only by the replacement of ventilation damper 35 with a tilt system regulation 60, the other regulation system 30 being formed by a movable flap 40. The regulating tilting device 60 presents itself, as is well known in trapezoidal, of constant thickness or not, mounted individually movable around an axis of rotation 62. The blades 61 are arranged side by side, of preferably at equal distance from each other, in the suction channel 14, and mounted in a circle concentric with the ventilation wheel 4. Advantageously, the blades 61 occupy an inclined position around their axis of rotation 62, relative to the extension plane of the central disc 10. Each blade 61 being connected to the rod-crank assembly 22 and to the command 21, it is thus possible to modify the positioning and the orientation angular of each blade 61, and this in a synchronous manner, for the whole series of blades 61 associated with the corresponding input 2. The dimensions and shapes of each series of blades 61 are such that in the so-called closed position, corresponding to an angular position defining an angulation equal to 0 °; the peripheral crown which they form between them substantially closes the suction channel 14 completely, the admitted fluid then being almost no.

Les pales 61 peuvent occuper toute position angulaire discrète comprise par exemple entre 0 et 105°, et préférentiellement entre 0° et 90°, étant entendu qu'à partir de la position angulaire nulle définie précédemment, le sens de déplacement et d'ouverture des pales 61 doit assurer une giration du flux de fluide dans le sens de rotation de la roue centrifuge 4. Ainsi, pour une position angulaire des pales 61, définie comme étant comprise entre 90° et 105°, le débit du flux d'aspiration sera maximal, puisque correspondant sensiblement à l'épaisseur et à la section transversale moyenne près des pales 61, à toute la section d'aspiration du canal 14.The blades 61 can occupy any discrete angular position included for example between 0 and 105 °, and preferably between 0 ° and 90 °, being understood that from the zero angular position defined above, the direction movement and opening of the blades 61 must ensure a gyration of the flow of fluid in the direction of rotation of the centrifugal wheel 4. Thus, for a position angular blades 61, defined as being between 90 ° and 105 °, the flow rate of the suction flow will be maximum, since corresponding substantially to the thickness and at the average cross section near the blades 61, at all channel suction section 14.

Dans cette seconde variante de réalisation, le système à inclineurs de régulation 60 constitue le système de régulation présentant la meilleure finesse de régulation, alors que le système à volet mobile 40 constitue le système de régulation présentant la finesse de régulation la plus sommaire. Le système à volet mobile 40 constitue néanmoins un système à faible perte de charge, à pleine ouverture, comparativement au système de régulation à inclineurs 60. In this second variant embodiment, the tilting system of regulation 60 is the regulation system with the best finesse regulation, while the movable flap system 40 constitutes the regulation with the most basic finesse of regulation. The system movable flap 40 nevertheless constitutes a system with low pressure drop, full opening, compared to the tilting regulation system 60.

La figure 7 illustre une troisième variante de réalisation, conforme à l'invention, de conception générale identique aux variantes précédentes, le système de régulation 30 associé à une entrée 2 étant formé par un inclineur de régulation 60, l'autre système de régulation 30 associé à l'entrée 3 étant un registre de régulation 35. Dans une telle configuration, le système de régulation à inclineur 60 est le système présentant la meilleure finesse de régulation, le système à registre de régulation 35 étant le système présentant la finesse de régulation la plus sommaire.FIG. 7 illustrates a third alternative embodiment, in accordance with the invention, of general design identical to the previous variants, the regulation system 30 associated with an input 2 being formed by an incliner regulation 60, the other regulation system 30 associated with input 3 being a regulation register 35. In such a configuration, the regulation system inclinator 60 is the system with the best finesse of regulation, the regulation register system 35 being the system presenting the finesse of most basic regulation.

La figure 7 illustre également une variante de réalisation supplémentaire de l'invention, qui ne diffère de toutes les variantes précédentes que par la présence, extérieurement au bâti principal 13 du dispositif de ventilation centrifuge 1, d'une gaine d'aspiration 50 disposée en amont des capots d'aspiration 17. De manière connue en soi, la gaine d'aspiration 50 comprend un conduit d'entrée 51, se divisant en deux conduits secondaires 52, 53, respectivement raccordés aux entrées 2 et 3 par l'intermédiaire des capots d'aspiration 17. Selon cette variante de réalisation, il est possible d'avoir indifféremment recours à l'une quelconque des combinaisons de systèmes de régulation 30 décrits précédemment. Avantageusement, la section de chacun des conduits secondaires 52, 53 est égale de manière à diviser le flux d'aspiration à ce niveau en deux flux d'aspiration sensiblement égaux.FIG. 7 also illustrates an additional alternative embodiment of the invention, which differs from all the previous variants only in that presence, outside the main frame 13 of the ventilation device centrifugal 1, of a suction sheath 50 disposed upstream of the covers suction 17. In a manner known per se, the suction sheath 50 comprises an inlet duct 51, dividing into two secondary ducts 52, 53, respectively connected to inputs 2 and 3 via covers according to this variant embodiment, it is possible to have indifferently recourse to any combination of regulation 30 described above. Advantageously, the section of each secondary conduits 52, 53 is equal so as to divide the flow suction at this level in two substantially equal suction flows.

Sans sortir du cadre de l'invention, il est même envisageable de monter l'un ou l'ensemble des systèmes de régulation 30 dans l'un des conduits 52, 53. Ceci est particulièrement envisageable dans le cas du montage d'un volet mobile 40.Without departing from the scope of the invention, it is even conceivable to mount one or all of the regulation systems 30 in one of the conduits 52, 53. This is particularly possible in the case of mounting a shutter mobile 40.

À titre de variante, il est également possible de réaliser une unité de ventilation centrifuge conforme à l'invention, en supprimant, pour l'une ou l'autre des entrées 2, 3, soit pour chacune des entrées 2, 3, le capot d'aspiration 17.Alternatively, it is also possible to make a unit of centrifugal ventilation according to the invention, by removing, for one or the other of inputs 2, 3, i.e. for each of inputs 2, 3, the cover suction 17.

Sans sortir du cadre de l'invention, il est possible de combiner entre eux tous les systèmes de régulation 30 de débit connu à ce jour, dès l'instant que l'appariement de ces systèmes implique dans leur fonctionnement une finesse de régulation différente. Ainsi, il est possible d'avoir recours à un registre de régulation-fermeture 35 à plusieurs pales, ou à une seule pale, ou encore à un simple volet mobile 40, de type à rotation ou à guillotine. Les systèmes de régulation à inclineurs 60 peuvent être indifféremment du type conique, cylindrique, ou à tonneau, par exemple.Without departing from the scope of the invention, it is possible to combine them all flow control systems 30 known to date, from the moment that the pairing of these systems implies in their functioning a finesse different regulation. Thus, it is possible to have recourse to a register of regulation-closure 35 with several blades, or with a single blade, or even with a simple movable flap 40, of the rotating or guillotine type. The systems of tilting regulation 60 can be either conical type, cylindrical, or barrel-shaped, for example.

De manière générale et à titre de variante de réalisation complémentaire, les systèmes de régulation 30 équipant chaque entrée 2, 3 peuvent être de même type, par exemple deux inclineurs de régulation 60 ou deux registres de régulation 35 dès l'instant qu'ils différent entre eux par leurs structures mécaniques. Dans de tels cas, les différences mécaniques portent avantageusement sur la géométrie des systèmes et incluent des variations, cumulatives ou non, de dimensions, nombres, ou formes des pales.In general and as an additional variant embodiment, the regulation systems 30 equipping each input 2, 3 can be same type, for example two regulating incliners 60 or two registers of regulation 35 as soon as they differ from each other by their structures mechanical. In such cases, mechanical differences carry advantageously on the geometry of the systems and include variations, cumulative or not, of dimensions, numbers, or shapes of the blades.

De la même façon, il est concevable de réaliser des dispositifs de ventilation centrifuge comportant des unités équipées de plus de deux entrées de fluide.In the same way, it is conceivable to produce devices for centrifugal ventilation comprising units fitted with more than two inlets of fluid.

La présente invention concerne également un procédé de ventilation centrifuge d'un fluide dans lequel, de manière continue et successive :

  • on aspire le fluide à ventiler par une roue centrifuge 4 à travers au moins deux entrées 2, 3 situées de part et d'autre de la roue 4, pour créer au moins un flux d'aspiration dans un dispositif de ventilation centrifuge 1;
  • on régule le débit du flux d'aspiration de manière dissymétrique entre les entrées 2,3, à l'aide de systèmes de régulation 30, associés à chaque entrée 2, 3;
  • on assure l'expulsion du flux d'aspiration par la roue centrifuge 4, à travers une sortie de refoulement 20.
The present invention also relates to a method of centrifugal ventilation of a fluid in which, continuously and successively:
  • the fluid to be ventilated is aspirated by a centrifugal wheel 4 through at least two inlets 2, 3 located on either side of the wheel 4, to create at least one suction flow in a centrifugal ventilation device 1;
  • the flow rate of the suction flow is regulated asymmetrically between the inlets 2, 3, with the aid of regulation systems 30, associated with each inlet 2, 3;
  • the suction flow is expelled by the centrifugal wheel 4, through a discharge outlet 20.

Le procédé, selon l'invention, consiste à réguler le débit du flux d'aspiration dans chaque entrée 2, 3, à l'aide de systèmes de régulation 30 associés à chaque entrée, assurant une finesse de régulation relative, qui est différente entre chaque entrée 2, 3.The method according to the invention consists in regulating the flow rate suction in each inlet 2, 3, using regulation systems 30 associated with each input, ensuring a relative finesse of regulation, which is different between each entry 2, 3.

Un tel procédé consiste à mettre en oeuvre le dispositif de ventilation centrifuge 1 décrit précédemment, en contrôlant et maítrisant parfaitement, de manière aérodynamique, le flux d'air rotatif et dissymétrique créé par les systèmes de régulation 30. Dès lors que les systèmes de régulation 30 différent par une finesse de régulation au moins égale à 5%, et de préférence comprise entre 5% et 20%, le procédé conforme à l'invention est particulièrement intéressant lorsqu'il comprend les étapes a) et b) suivantes :

  • étape a) : pour une plage de marche partielle de l'unité de ventilation comprise sensiblement entre 100% et 80% du débit total d'aspiration, le procédé consiste, lors de l'étape a, à assurer la régulation à l'aide d'un seul système de régulation 30, susceptible de passer respectivement de sa position ouverte (correspondant au débit d'aspiration maximal et total) à sa position fermée, l'autre système étant maintenu constamment en position ouverte fixe.
  • étape b) : puis, pour une plage de marche partielle inférieure à 80% du débit d'aspiration total, à assurer la régulation au moins à l'aide du système de régulation maintenu en position ouverte fixe au cours de l'étape a, en le fermant progressivement jusqu'à la valeur correspondant au débit d'aspiration souhaité.
Such a method consists in implementing the centrifugal ventilation device 1 described above, by controlling and perfectly controlling, aerodynamically, the rotary and asymmetrical air flow created by the regulation systems 30. As soon as the regulation systems 30 different by a fineness of regulation at least equal to 5%, and preferably between 5% and 20%, the process according to the invention is particularly advantageous when it comprises the following steps a) and b):
  • step a): for a partial operating range of the ventilation unit comprised substantially between 100% and 80% of the total suction flow, the process consists, during step a, of ensuring regulation using of a single regulation system 30, capable of passing respectively from its open position (corresponding to the maximum and total suction flow) to its closed position, the other system being kept constantly in the fixed open position.
  • step b): then, for a partial operating range of less than 80% of the total suction flow rate, to ensure regulation at least using the regulation system maintained in the fixed open position during step a, by gradually closing it up to the value corresponding to the desired suction flow.

La combinaison de ces deux étapes a) et b) permet en effet de bénéficier d'un rendement maximal à marche partielle, comme l'indiquent les graphes portés à la figure 1. La courbe c montre l'évolution des rendements obtenus avec un système et procédé classique de l'art antérieur, mettant en oeuvre un ventilateur équipé pour chacune de ses entrées de systèmes de régulation identiques à inclineurs, la courbe c représentant ici le dispositif ayant la meilleure finesse de régulation. Les courbes a et b montrent les résultats et gains de rendement obtenus à l'aide d'un dispositif et procédé conforme à l'invention. Les courbes a et b sont pratiquement confondues pour des allures de fonctionnement à marche partielle comprises dans la plage 10-80%du débit total, alors que par commodité de présentation elles apparaissent légèrement décalées sur la Figure 1. Une indication du calage angulaire des pales 35a, ou 61, ailettes ou volets mobiles 40 est indiquée pour chacune de ces courbes par un couple de nombres exprimés en degrés, le premier nombre (situé le plus gauche) étant relatif à l'ouverture angulaire du système de régulation dit "sommaire", le deuxième nombre (situé le plus à droite) étant relatif à l'ouverture angulaire du système de régulation 30 présentant la meilleure finesse de régulation. L'analyse comparative des rendements obtenus pour toutes les plages de marche partielle d'un ventilateur centrifuge à au moins deux entrées, montre que le procédé et dispositif conforme à l'invention procure ici des résultats sensiblement équivalents mais cependant un peu inférieurs pour des allures de fonctionnement élevées (supérieures à 80% du débit total), et des résultats supérieurs pour une plage de marche partielle comprise entre 40 et 80%, alors même que les moyens mis en oeuvre sont de coûts réduits, et d'une mise en oeuvre particulièrement simple.The combination of these two stages a) and b) indeed makes it possible to benefit maximum efficiency at partial operation, as shown in the graphs shown in Figure 1. Curve c shows the evolution of the yields obtained with a conventional system and method of the prior art, implementing a fan equipped for each of its inputs with regulation systems identical to tilters, the curve c here representing the device having the better regulation finesse. Curves a and b show the results and yield gains obtained using a device and method in accordance with the invention. Curves a and b are almost identical for gaits operating at partial operation in the range 10-80% of flow total, while for convenience of presentation they appear slightly offset in Figure 1. An indication of the angular setting of the blades 35a, or 61, fins or movable flaps 40 is indicated for each of these curves by a couple of numbers expressed in degrees, the first number (located the most left) being relative to the angular opening of the regulation system called "summary", the second number (located on the far right) relating to the angular opening of the regulation system 30 having the best fine regulation. Comparative analysis of the yields obtained for all partial operating ranges from a centrifugal fan to at least two inputs, shows that the method and device according to the invention provides here substantially equivalent but somewhat lower results for high operating speeds (greater than 80% of the total flow), and superior results for a partial walking range between 40 and 80%, even though the means used are reduced costs, and of a particularly simple implementation.

Le procédé selon l'invention consiste, selon une première variante de réalisation, à fermer progressivement au cours de l'étape a), le système de régulation 30 présentant la finesse de régulation la plus sommaire, puis, au cours de l'étape b) à fermer progressivement l'autre système de régulation. Cette première variante de réalisation est exprimée par le graphe de la courbe b illustrant l'évolution du rendement, dans le cas d'un dispositif équipé d'un registre de ventilation 35 et d'un système de régulation à inclineur 60. Dans cette variante de réalisation, le registre de régulation 35 est utilisé prioritairement pour assurer une marche partielle du ventilateur comprise entre 80% et 100% de son débit total, l'ouverture des pales 35a variant progressivement de leur pleine ouverture à leur fermeture totale. Les pertes de rendement constatées en regard de la courbe c sont faibles, et largement compensées par les gains obtenus aux plages de fonctionnement inférieures, au cours desquelles seules les pales 61 sont utilisées pour assurer la régulation du débit. The method according to the invention consists, according to a first variant of realization, to be closed progressively during step a), the system of regulation 30 presenting the most basic finesse of regulation, then, at during step b) gradually closing the other regulatory system. This first variant is expressed by the graph of the curve b illustrating the performance evolution, in the case of a device equipped with a ventilation damper 35 and a tilt control system 60. In this variant embodiment, the regulation register 35 is used primarily to ensure partial operation of the fan between 80% and 100% of its total flow, the opening of the blades 35a varying gradually from their full opening to their total closure. The losses of yield observed against curve c are low, and largely compensated by the gains obtained at the lower operating ranges, during which only the blades 61 are used to ensure the flow regulation.

Selon une autre variante de réalisation particulièrement avantageuse de l'invention, exprimée par la courbe a, le procédé consiste, au cours de l'étape a), à fermer progressivement, pour les allures de fonctionnement à marche partielle haute (de 100% à 80% du débit total), le système de régulation 30 présentant la meilleure finesse de régulation, puis à débuter l'étape b) par la commande simultanée de l'ouverture totale du système de régulation présentant la meilleure finesse de régulation, tout en fermant totalement et rapidement le système de régulation préalablement ouvert et présentant la finesse de régulation la plus sommaire. L'étape b) se poursuit en assurant la régulation par le système de régulation 30 présentant la meilleure finesse de régulation. Ces opérations sont effectuées en maintenant le débit du ventilateur à un niveau sensiblement constant (au voisinage de 80%), avant de poursuivre la régulation pour des marches partielles inférieures à 80%, à l'aide du système de régulation présentant la meilleure finesse de régulation. La mise en oeuvre de cette seconde variante de réalisation est préférentiellement réalisée par l'association d'un système de régulation à inclineurs 60 avec un système de régulation à registre, de type à volet mobile 40, susceptible de prendre seulement une position fermée ou ouverte.According to another particularly advantageous variant of the invention, expressed by curve a, the method consists, during the step a), to be closed progressively, for running gaits partial high (from 100% to 80% of the total flow), the regulation system 30 exhibiting the best finesse of regulation, then starting step b) with the simultaneous control of the total opening of the regulation system with the best finesse of regulation, while completely closing and quickly the regulation system previously opened and presenting the most basic finesse of regulation. Step b) continues, ensuring the regulation by the regulation system 30 having the best finesse of regulation. These operations are performed while maintaining the fan flow at a substantially constant level (around 80%), before continuing regulation for partial steps of less than 80%, using the system with the best regulation finesse. Implementation of this second variant embodiment is preferably carried out by the combination of a tilting regulation system 60 with a damper regulation, of the movable flap type 40, capable of taking only a closed or open position.

Grâce à ces étapes opératoires, les rendements obtenus selon l'invention sont significativement supérieurs aux techniques de régulation de l'art antérieur (courbe c) pour des marches partielles du ventilateur inférieures à 80%, les gains de rendement obtenus selon la courbe a (marche partielle de 80% à 100% du débit total) aux allures hautes de fonctionnement, étant sensiblement identiques à la courbe c de l'art antérieur et supérieures à la courbe b.Thanks to these operating steps, the yields obtained according to the invention are significantly superior to prior art regulatory techniques (curve c) for partial fan steps of less than 80%, the yield gains obtained according to curve a (partial step of 80% at 100% of total flow) at high operating speeds, being substantially identical to curve c of the prior art and greater than curve b.

Il apparaít en conséquence que le dispositif et procédé selon l'invention permet de bénéficier d'un rendement maximal pour toutes les allures de fonctionnement à marche partielle du ventilateur. Il s'avère en effet possible par le choix judicieux des systèmes de régulation associés sur une même installation de maítriser et modeler la forme de la courbe de régulation pour répondre au mieux aux exigences de l'installation utilisatrice du dispositif de ventilation. Le dispositif et procédé selon l'invention permet en outre d'améliorer le rendement global à pleine ouverture des systèmes de régulation de débit, puisqu'il met en oeuvre au moins un système de régulation, tel qu'un registre de régulation 35 à pales ou un volet mobile 40, introduisant une perte de charge à pleine ouverture, significativement plus faible que la perte de charge susceptible d'être générée par un système de régulation à inclineur 60. L'invention permet en outre de réduire le coût global de l'ensemble des systèmes de régulation, sans pour autant réduire son efficacité, mais au contraire en l'augmentant puisque, même aux allures de fonctionnement élevées, les rendements obtenus sont comparables aux meilleurs systèmes connus actuellement.It therefore appears that the device and method according to the invention allows to benefit from a maximum output for all gaits of partial fan operation. It is indeed possible by the judicious choice of associated regulation systems on the same installation to master and model the shape of the regulation curve for best meet the requirements of the installation using the ventilation. The device and method according to the invention also makes it possible to improve the overall efficiency at full opening of flow control systems, since it implements at least one regulation system, such as a register regulator 35 with blades or a movable flap 40, introducing a loss of load at full opening, significantly lower than the pressure drop capable of being generated by a tilting regulation system 60. The invention also makes it possible to reduce the overall cost of all of the regulatory systems, without reducing its efficiency, but at contrary by increasing it since, even at operating speeds high, the yields obtained are comparable to the best systems currently known.

Claims (16)

  1. Partial-running centrifugal ventilation device (1) having at least one delivery outlet (20) and at least two fluid inlets (2, 3) disposed on each side of a ventilation wheel (4) able to be driven in rotation by a drive means, each inlet (2, 3) being associated with a system (30) for regulating the suction flow of the fluid able to create an asymmetric suction flow between the inlets (2, 3) in order to provide partial running of the said device, characterised in that the inlets (2, 3) are equipped with non-identical regulation systems (30) which differ from each other through their mechanical structures and their relative characteristics of fineness of regulation so as to control and model the shape of the regulation curve at all partial-running operating speeds.
  2. Device according to Claim 1, characterised in that the regulation system (30) associated with an inlet (2, 3) comprises a regulation system having good fineness of regulation, the other inlet (2, 3) being associated with a regulation system (30) of inferior quality, having a basic regulation fineness, the said systems differing from each other by a fineness of regulation of at least 5%, and preferably between 5% and 20%.
  3. Device according to Claim 2, characterised in that the basic regulation system (30) is a system with low pressure drop at full opening compared with the other regulation system (30).
  4. Device according to Claim 1 or Claim 2, characterised in that the regulation system (30) associated with one inlet is formed by a regulation tilter (60), the other system being a regulation register (35).
  5. Device according to one of Claims 1 to 3, characterised in that the regulation system (30) associated with one inlet (2, 3) is formed by a regulation tilter (60), the other inlet being provided with a movable flap (40) for regulation and closure or a regulation register (35) with a single blade (35a).
  6. Device according to Claim 1 or Claim 2, characterised in that the regulation system (30) associated with one inlet (2, 3) is formed by a regulation register (35), the other inlet (2, 3) being provided with a movable flap (40) for regulation and closure.
  7. Device according to one of Claims 1 to 6, characterised in that it comprises a suction duct (50) dividing into two secondary conduits (52, 53) connected respectively to the inlets (2, 3).
  8. Device according to Claim 7, characterised in that at least one of the regulation systems (30) is mounted in the suction duct (50).
  9. Device according to one of Claims 1 to 8, characterised in that it comprises two fluid inlets (2, 3).
  10. Industrial ventilator equipped with a device according to one of Claims 1 to 9.
  11. Method of centrifugal ventilation of a fluid by means of a partial-running ventilation unit in which, continuously and successively:
    the fluid to be ventilated is sucked by a centrifugal wheel through at least two inlets situated on each side of the wheel in order to create at least one suction flow;
    the flow rate of the suction flow is adjusted asymmetrically between the inlets by means of regulation systems associated with each inlet in order to provide partial running of the ventilatior unit;
    the expulsion of the suction flow is provided by the centrifugal wheel, through a delivery outlet, characterised in that it consists of regulating the flow rate of the suction flow by means of regulation systems providing a relative fineness of regulation which is different between each inlet so as to control and model the shape of the regulation curve at all partial-running operating speeds.
  12. Method according to Claim 11, characterised in that the regulation systems differ from each other through a fineness of regulation of at least 5% and preferably of between 5% and 20%.
  13. Method according to Claim 11 or 12, characterised in that it comprises the following steps a) and b):
    a) for a partial-running range of the ventilation unit of between substantially 100% and 80% of the total suction rate, of providing the regulation by means of a single regulation system able to change respectively from its open position to its closed position, the other system being kept constantly in the fixed open position;
    b) then, for a partial-running range of less than 80% of the total rate, providing the regulation at least by means of the system kept in the fixed open position during step a), closing it progressively as far as the value corresponding to the required rate.
  14. Method according to Claim 13, characterised in that it consists of:
    during step a), progressively closing the regulation system having the most basic regulation fineness;
    then, during step b), subsequently progressively closing the other regulation system.
  15. Method according to Claim 13, characterised in that it consists of:
    during step a), progressively closing the regulation system having the best regulation fineness;
    then starting step b) with the simultaneous command for complete opening of the regulation system having the best regulation fineness, whilst completely closing the regulation system having the most basic regulation fineness;
    continuing step b), providing regulation by the regulation system having the best regulation fineness.
  16. Method according to Claim 15, characterised in that a flap able to adopt solely a closed or open position is used as the regulation system having the most basic regulation fineness.
EP97420141A 1996-08-07 1997-08-06 Centrifugal ventilation device of enhanced performance having at least two suction inlets and related ventilation method Expired - Lifetime EP0823555B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9610135A FR2752271B1 (en) 1996-08-07 1996-08-07 CENTRIFUGAL VENTILATION DEVICE WITH IMPROVED PERFORMANCE COMPRISING AT LEAST TWO SUCTION INPUTS AND VENTILATION METHOD THEREFOR
FR9610135 1996-08-07

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EP0823555A1 EP0823555A1 (en) 1998-02-11
EP0823555B1 true EP0823555B1 (en) 2003-04-02

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EP (1) EP0823555B1 (en)
JP (1) JP2000515604A (en)
CN (1) CN1270099C (en)
AT (1) ATE236356T1 (en)
AU (1) AU724577B2 (en)
BR (1) BR9711172A (en)
DE (1) DE69720340T2 (en)
DK (1) DK0823555T3 (en)
ES (1) ES2196283T3 (en)
FR (1) FR2752271B1 (en)
ID (1) ID17983A (en)
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ZA (1) ZA977001B (en)

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DE69720340T2 (en) 2005-04-07
BR9711172A (en) 2000-01-11
AU3945797A (en) 1998-02-25
ZA977001B (en) 1998-03-03
FR2752271B1 (en) 1998-10-09
TW490536B (en) 2002-06-11
CN1188857A (en) 1998-07-29
DK0823555T3 (en) 2003-07-21
FR2752271A1 (en) 1998-02-13
EP0823555A1 (en) 1998-02-11
US5980199A (en) 1999-11-09
ES2196283T3 (en) 2003-12-16
ATE236356T1 (en) 2003-04-15
JP2000515604A (en) 2000-11-21
CN1270099C (en) 2006-08-16
WO1998005867A1 (en) 1998-02-12
AU724577B2 (en) 2000-09-28
ID17983A (en) 1998-02-12
DE69720340D1 (en) 2003-05-08

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